SOLR3 (3sciport)

Solves a second order linear recurrence for three terms

SYNOPSIS

  CALL SOLR3( n, x, incx, y, incy, z, incz )

ARGUMENTS

  n               Integer.
                  The length of the linear recurrence. If n <= 0, SOLR3
                  returns without any computation.

  x               Real vector.
                  An input vector of length n.

  incx            Integer.
                  The increment between elements of vector x.

  y               Real vector.
                  An input vector of length n.

  incy            Integer.
                  The increment between elements of vector y.

  z               Real vector.
                  A result vector of length n.

  incz            Integer.
                  The increment between elements of vector z.

DESCRIPTION

  SOLR3 computes a second order linear recurrence of three terms as in:

          DO I = 3,N
             Z(I) = Z(I+2) + X(I-2)*Z(I-1) + Y(I-2)Z(I-2)
          ENDDO

  All values of z are input to the routine, and elements z(3) through z(n)
  are output.

  For equations and other information, see Volume 3: UNICOS Math and
  Scientific Library Reference Manual SR-2081 7.0, Cray Research, Inc.